1 /* 2 * BSS client mode implementation 3 * Copyright 2003-2008, Jouni Malinen <j@w1.fi> 4 * Copyright 2004, Instant802 Networks, Inc. 5 * Copyright 2005, Devicescape Software, Inc. 6 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> 7 * Copyright 2007, Michael Wu <flamingice@sourmilk.net> 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License version 2 as 11 * published by the Free Software Foundation. 12 */ 13 14 #include <linux/delay.h> 15 #include <linux/if_ether.h> 16 #include <linux/skbuff.h> 17 #include <linux/if_arp.h> 18 #include <linux/etherdevice.h> 19 #include <linux/moduleparam.h> 20 #include <linux/rtnetlink.h> 21 #include <linux/pm_qos.h> 22 #include <linux/crc32.h> 23 #include <linux/slab.h> 24 #include <linux/export.h> 25 #include <net/mac80211.h> 26 #include <asm/unaligned.h> 27 28 #include "ieee80211_i.h" 29 #include "driver-ops.h" 30 #include "rate.h" 31 #include "led.h" 32 33 static int max_nullfunc_tries = 2; 34 module_param(max_nullfunc_tries, int, 0644); 35 MODULE_PARM_DESC(max_nullfunc_tries, 36 "Maximum nullfunc tx tries before disconnecting (reason 4)."); 37 38 static int max_probe_tries = 5; 39 module_param(max_probe_tries, int, 0644); 40 MODULE_PARM_DESC(max_probe_tries, 41 "Maximum probe tries before disconnecting (reason 4)."); 42 43 /* 44 * Beacon loss timeout is calculated as N frames times the 45 * advertised beacon interval. This may need to be somewhat 46 * higher than what hardware might detect to account for 47 * delays in the host processing frames. But since we also 48 * probe on beacon miss before declaring the connection lost 49 * default to what we want. 50 */ 51 #define IEEE80211_BEACON_LOSS_COUNT 7 52 53 /* 54 * Time the connection can be idle before we probe 55 * it to see if we can still talk to the AP. 56 */ 57 #define IEEE80211_CONNECTION_IDLE_TIME (30 * HZ) 58 /* 59 * Time we wait for a probe response after sending 60 * a probe request because of beacon loss or for 61 * checking the connection still works. 62 */ 63 static int probe_wait_ms = 500; 64 module_param(probe_wait_ms, int, 0644); 65 MODULE_PARM_DESC(probe_wait_ms, 66 "Maximum time(ms) to wait for probe response" 67 " before disconnecting (reason 4)."); 68 69 /* 70 * Weight given to the latest Beacon frame when calculating average signal 71 * strength for Beacon frames received in the current BSS. This must be 72 * between 1 and 15. 73 */ 74 #define IEEE80211_SIGNAL_AVE_WEIGHT 3 75 76 /* 77 * How many Beacon frames need to have been used in average signal strength 78 * before starting to indicate signal change events. 79 */ 80 #define IEEE80211_SIGNAL_AVE_MIN_COUNT 4 81 82 #define TMR_RUNNING_TIMER 0 83 #define TMR_RUNNING_CHANSW 1 84 85 /* 86 * All cfg80211 functions have to be called outside a locked 87 * section so that they can acquire a lock themselves... This 88 * is much simpler than queuing up things in cfg80211, but we 89 * do need some indirection for that here. 90 */ 91 enum rx_mgmt_action { 92 /* no action required */ 93 RX_MGMT_NONE, 94 95 /* caller must call cfg80211_send_deauth() */ 96 RX_MGMT_CFG80211_DEAUTH, 97 98 /* caller must call cfg80211_send_disassoc() */ 99 RX_MGMT_CFG80211_DISASSOC, 100 }; 101 102 /* utils */ 103 static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd) 104 { 105 lockdep_assert_held(&ifmgd->mtx); 106 } 107 108 /* 109 * We can have multiple work items (and connection probing) 110 * scheduling this timer, but we need to take care to only 111 * reschedule it when it should fire _earlier_ than it was 112 * asked for before, or if it's not pending right now. This 113 * function ensures that. Note that it then is required to 114 * run this function for all timeouts after the first one 115 * has happened -- the work that runs from this timer will 116 * do that. 117 */ 118 static void run_again(struct ieee80211_if_managed *ifmgd, 119 unsigned long timeout) 120 { 121 ASSERT_MGD_MTX(ifmgd); 122 123 if (!timer_pending(&ifmgd->timer) || 124 time_before(timeout, ifmgd->timer.expires)) 125 mod_timer(&ifmgd->timer, timeout); 126 } 127 128 void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata) 129 { 130 if (sdata->local->hw.flags & IEEE80211_HW_BEACON_FILTER) 131 return; 132 133 mod_timer(&sdata->u.mgd.bcn_mon_timer, 134 round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout)); 135 } 136 137 void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata) 138 { 139 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 140 141 if (unlikely(!sdata->u.mgd.associated)) 142 return; 143 144 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR) 145 return; 146 147 mod_timer(&sdata->u.mgd.conn_mon_timer, 148 round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME)); 149 150 ifmgd->probe_send_count = 0; 151 } 152 153 static int ecw2cw(int ecw) 154 { 155 return (1 << ecw) - 1; 156 } 157 158 /* 159 * ieee80211_enable_ht should be called only after the operating band 160 * has been determined as ht configuration depends on the hw's 161 * HT abilities for a specific band. 162 */ 163 static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata, 164 struct ieee80211_ht_info *hti, 165 const u8 *bssid, u16 ap_ht_cap_flags, 166 bool beacon_htcap_ie) 167 { 168 struct ieee80211_local *local = sdata->local; 169 struct ieee80211_supported_band *sband; 170 struct sta_info *sta; 171 u32 changed = 0; 172 int hti_cfreq; 173 u16 ht_opmode; 174 bool enable_ht = true; 175 enum nl80211_channel_type prev_chantype; 176 enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT; 177 178 sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; 179 180 prev_chantype = sdata->vif.bss_conf.channel_type; 181 182 /* HT is not supported */ 183 if (!sband->ht_cap.ht_supported) 184 enable_ht = false; 185 186 if (enable_ht) { 187 hti_cfreq = ieee80211_channel_to_frequency(hti->control_chan, 188 sband->band); 189 /* check that channel matches the right operating channel */ 190 if (local->hw.conf.channel->center_freq != hti_cfreq) { 191 /* Some APs mess this up, evidently. 192 * Netgear WNDR3700 sometimes reports 4 higher than 193 * the actual channel, for instance. 194 */ 195 printk(KERN_DEBUG 196 "%s: Wrong control channel in association" 197 " response: configured center-freq: %d" 198 " hti-cfreq: %d hti->control_chan: %d" 199 " band: %d. Disabling HT.\n", 200 sdata->name, 201 local->hw.conf.channel->center_freq, 202 hti_cfreq, hti->control_chan, 203 sband->band); 204 enable_ht = false; 205 } 206 } 207 208 if (enable_ht) { 209 channel_type = NL80211_CHAN_HT20; 210 211 if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) && 212 (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) && 213 (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) { 214 switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) { 215 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE: 216 if (!(local->hw.conf.channel->flags & 217 IEEE80211_CHAN_NO_HT40PLUS)) 218 channel_type = NL80211_CHAN_HT40PLUS; 219 break; 220 case IEEE80211_HT_PARAM_CHA_SEC_BELOW: 221 if (!(local->hw.conf.channel->flags & 222 IEEE80211_CHAN_NO_HT40MINUS)) 223 channel_type = NL80211_CHAN_HT40MINUS; 224 break; 225 } 226 } 227 } 228 229 if (local->tmp_channel) 230 local->tmp_channel_type = channel_type; 231 232 if (!ieee80211_set_channel_type(local, sdata, channel_type)) { 233 /* can only fail due to HT40+/- mismatch */ 234 channel_type = NL80211_CHAN_HT20; 235 WARN_ON(!ieee80211_set_channel_type(local, sdata, channel_type)); 236 } 237 238 if (beacon_htcap_ie && (prev_chantype != channel_type)) { 239 /* 240 * Whenever the AP announces the HT mode change that can be 241 * 40MHz intolerant or etc., it would be safer to stop tx 242 * queues before doing hw config to avoid buffer overflow. 243 */ 244 ieee80211_stop_queues_by_reason(&sdata->local->hw, 245 IEEE80211_QUEUE_STOP_REASON_CHTYPE_CHANGE); 246 247 /* flush out all packets */ 248 synchronize_net(); 249 250 drv_flush(local, false); 251 } 252 253 /* channel_type change automatically detected */ 254 ieee80211_hw_config(local, 0); 255 256 if (prev_chantype != channel_type) { 257 rcu_read_lock(); 258 sta = sta_info_get(sdata, bssid); 259 if (sta) 260 rate_control_rate_update(local, sband, sta, 261 IEEE80211_RC_HT_CHANGED, 262 channel_type); 263 rcu_read_unlock(); 264 265 if (beacon_htcap_ie) 266 ieee80211_wake_queues_by_reason(&sdata->local->hw, 267 IEEE80211_QUEUE_STOP_REASON_CHTYPE_CHANGE); 268 } 269 270 ht_opmode = le16_to_cpu(hti->operation_mode); 271 272 /* if bss configuration changed store the new one */ 273 if (sdata->ht_opmode_valid != enable_ht || 274 sdata->vif.bss_conf.ht_operation_mode != ht_opmode || 275 prev_chantype != channel_type) { 276 changed |= BSS_CHANGED_HT; 277 sdata->vif.bss_conf.ht_operation_mode = ht_opmode; 278 sdata->ht_opmode_valid = enable_ht; 279 } 280 281 return changed; 282 } 283 284 /* frame sending functions */ 285 286 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata, 287 const u8 *bssid, u16 stype, u16 reason, 288 void *cookie, bool send_frame) 289 { 290 struct ieee80211_local *local = sdata->local; 291 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 292 struct sk_buff *skb; 293 struct ieee80211_mgmt *mgmt; 294 295 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt)); 296 if (!skb) 297 return; 298 299 skb_reserve(skb, local->hw.extra_tx_headroom); 300 301 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24); 302 memset(mgmt, 0, 24); 303 memcpy(mgmt->da, bssid, ETH_ALEN); 304 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 305 memcpy(mgmt->bssid, bssid, ETH_ALEN); 306 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype); 307 skb_put(skb, 2); 308 /* u.deauth.reason_code == u.disassoc.reason_code */ 309 mgmt->u.deauth.reason_code = cpu_to_le16(reason); 310 311 if (stype == IEEE80211_STYPE_DEAUTH) 312 if (cookie) 313 __cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len); 314 else 315 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len); 316 else 317 if (cookie) 318 __cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len); 319 else 320 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len); 321 if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED)) 322 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 323 324 if (send_frame) 325 ieee80211_tx_skb(sdata, skb); 326 else 327 kfree_skb(skb); 328 } 329 330 void ieee80211_send_pspoll(struct ieee80211_local *local, 331 struct ieee80211_sub_if_data *sdata) 332 { 333 struct ieee80211_pspoll *pspoll; 334 struct sk_buff *skb; 335 336 skb = ieee80211_pspoll_get(&local->hw, &sdata->vif); 337 if (!skb) 338 return; 339 340 pspoll = (struct ieee80211_pspoll *) skb->data; 341 pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM); 342 343 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 344 ieee80211_tx_skb(sdata, skb); 345 } 346 347 void ieee80211_send_nullfunc(struct ieee80211_local *local, 348 struct ieee80211_sub_if_data *sdata, 349 int powersave) 350 { 351 struct sk_buff *skb; 352 struct ieee80211_hdr_3addr *nullfunc; 353 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 354 355 skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif); 356 if (!skb) 357 return; 358 359 nullfunc = (struct ieee80211_hdr_3addr *) skb->data; 360 if (powersave) 361 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM); 362 363 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 364 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL | 365 IEEE80211_STA_CONNECTION_POLL)) 366 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE; 367 368 ieee80211_tx_skb(sdata, skb); 369 } 370 371 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local, 372 struct ieee80211_sub_if_data *sdata) 373 { 374 struct sk_buff *skb; 375 struct ieee80211_hdr *nullfunc; 376 __le16 fc; 377 378 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION)) 379 return; 380 381 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30); 382 if (!skb) 383 return; 384 385 skb_reserve(skb, local->hw.extra_tx_headroom); 386 387 nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30); 388 memset(nullfunc, 0, 30); 389 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC | 390 IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 391 nullfunc->frame_control = fc; 392 memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN); 393 memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN); 394 memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN); 395 memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN); 396 397 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 398 ieee80211_tx_skb(sdata, skb); 399 } 400 401 /* spectrum management related things */ 402 static void ieee80211_chswitch_work(struct work_struct *work) 403 { 404 struct ieee80211_sub_if_data *sdata = 405 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work); 406 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 407 408 if (!ieee80211_sdata_running(sdata)) 409 return; 410 411 mutex_lock(&ifmgd->mtx); 412 if (!ifmgd->associated) 413 goto out; 414 415 sdata->local->oper_channel = sdata->local->csa_channel; 416 if (!sdata->local->ops->channel_switch) { 417 /* call "hw_config" only if doing sw channel switch */ 418 ieee80211_hw_config(sdata->local, 419 IEEE80211_CONF_CHANGE_CHANNEL); 420 } else { 421 /* update the device channel directly */ 422 sdata->local->hw.conf.channel = sdata->local->oper_channel; 423 } 424 425 /* XXX: shouldn't really modify cfg80211-owned data! */ 426 ifmgd->associated->channel = sdata->local->oper_channel; 427 428 ieee80211_wake_queues_by_reason(&sdata->local->hw, 429 IEEE80211_QUEUE_STOP_REASON_CSA); 430 out: 431 ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED; 432 mutex_unlock(&ifmgd->mtx); 433 } 434 435 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success) 436 { 437 struct ieee80211_sub_if_data *sdata; 438 struct ieee80211_if_managed *ifmgd; 439 440 sdata = vif_to_sdata(vif); 441 ifmgd = &sdata->u.mgd; 442 443 trace_api_chswitch_done(sdata, success); 444 if (!success) { 445 /* 446 * If the channel switch was not successful, stay 447 * around on the old channel. We currently lack 448 * good handling of this situation, possibly we 449 * should just drop the association. 450 */ 451 sdata->local->csa_channel = sdata->local->oper_channel; 452 } 453 454 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work); 455 } 456 EXPORT_SYMBOL(ieee80211_chswitch_done); 457 458 static void ieee80211_chswitch_timer(unsigned long data) 459 { 460 struct ieee80211_sub_if_data *sdata = 461 (struct ieee80211_sub_if_data *) data; 462 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 463 464 if (sdata->local->quiescing) { 465 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running); 466 return; 467 } 468 469 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work); 470 } 471 472 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata, 473 struct ieee80211_channel_sw_ie *sw_elem, 474 struct ieee80211_bss *bss, 475 u64 timestamp) 476 { 477 struct cfg80211_bss *cbss = 478 container_of((void *)bss, struct cfg80211_bss, priv); 479 struct ieee80211_channel *new_ch; 480 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 481 int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num, 482 cbss->channel->band); 483 484 ASSERT_MGD_MTX(ifmgd); 485 486 if (!ifmgd->associated) 487 return; 488 489 if (sdata->local->scanning) 490 return; 491 492 /* Disregard subsequent beacons if we are already running a timer 493 processing a CSA */ 494 495 if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED) 496 return; 497 498 new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq); 499 if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED) 500 return; 501 502 sdata->local->csa_channel = new_ch; 503 504 if (sdata->local->ops->channel_switch) { 505 /* use driver's channel switch callback */ 506 struct ieee80211_channel_switch ch_switch; 507 memset(&ch_switch, 0, sizeof(ch_switch)); 508 ch_switch.timestamp = timestamp; 509 if (sw_elem->mode) { 510 ch_switch.block_tx = true; 511 ieee80211_stop_queues_by_reason(&sdata->local->hw, 512 IEEE80211_QUEUE_STOP_REASON_CSA); 513 } 514 ch_switch.channel = new_ch; 515 ch_switch.count = sw_elem->count; 516 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED; 517 drv_channel_switch(sdata->local, &ch_switch); 518 return; 519 } 520 521 /* channel switch handled in software */ 522 if (sw_elem->count <= 1) { 523 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work); 524 } else { 525 if (sw_elem->mode) 526 ieee80211_stop_queues_by_reason(&sdata->local->hw, 527 IEEE80211_QUEUE_STOP_REASON_CSA); 528 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED; 529 mod_timer(&ifmgd->chswitch_timer, 530 jiffies + 531 msecs_to_jiffies(sw_elem->count * 532 cbss->beacon_interval)); 533 } 534 } 535 536 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata, 537 u16 capab_info, u8 *pwr_constr_elem, 538 u8 pwr_constr_elem_len) 539 { 540 struct ieee80211_conf *conf = &sdata->local->hw.conf; 541 542 if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT)) 543 return; 544 545 /* Power constraint IE length should be 1 octet */ 546 if (pwr_constr_elem_len != 1) 547 return; 548 549 if ((*pwr_constr_elem <= conf->channel->max_power) && 550 (*pwr_constr_elem != sdata->local->power_constr_level)) { 551 sdata->local->power_constr_level = *pwr_constr_elem; 552 ieee80211_hw_config(sdata->local, 0); 553 } 554 } 555 556 void ieee80211_enable_dyn_ps(struct ieee80211_vif *vif) 557 { 558 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 559 struct ieee80211_local *local = sdata->local; 560 struct ieee80211_conf *conf = &local->hw.conf; 561 562 WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION || 563 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) || 564 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)); 565 566 local->disable_dynamic_ps = false; 567 conf->dynamic_ps_timeout = local->dynamic_ps_user_timeout; 568 } 569 EXPORT_SYMBOL(ieee80211_enable_dyn_ps); 570 571 void ieee80211_disable_dyn_ps(struct ieee80211_vif *vif) 572 { 573 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 574 struct ieee80211_local *local = sdata->local; 575 struct ieee80211_conf *conf = &local->hw.conf; 576 577 WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION || 578 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) || 579 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)); 580 581 local->disable_dynamic_ps = true; 582 conf->dynamic_ps_timeout = 0; 583 del_timer_sync(&local->dynamic_ps_timer); 584 ieee80211_queue_work(&local->hw, 585 &local->dynamic_ps_enable_work); 586 } 587 EXPORT_SYMBOL(ieee80211_disable_dyn_ps); 588 589 /* powersave */ 590 static void ieee80211_enable_ps(struct ieee80211_local *local, 591 struct ieee80211_sub_if_data *sdata) 592 { 593 struct ieee80211_conf *conf = &local->hw.conf; 594 595 /* 596 * If we are scanning right now then the parameters will 597 * take effect when scan finishes. 598 */ 599 if (local->scanning) 600 return; 601 602 if (conf->dynamic_ps_timeout > 0 && 603 !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) { 604 mod_timer(&local->dynamic_ps_timer, jiffies + 605 msecs_to_jiffies(conf->dynamic_ps_timeout)); 606 } else { 607 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) 608 ieee80211_send_nullfunc(local, sdata, 1); 609 610 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) && 611 (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)) 612 return; 613 614 conf->flags |= IEEE80211_CONF_PS; 615 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 616 } 617 } 618 619 static void ieee80211_change_ps(struct ieee80211_local *local) 620 { 621 struct ieee80211_conf *conf = &local->hw.conf; 622 623 if (local->ps_sdata) { 624 ieee80211_enable_ps(local, local->ps_sdata); 625 } else if (conf->flags & IEEE80211_CONF_PS) { 626 conf->flags &= ~IEEE80211_CONF_PS; 627 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 628 del_timer_sync(&local->dynamic_ps_timer); 629 cancel_work_sync(&local->dynamic_ps_enable_work); 630 } 631 } 632 633 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata) 634 { 635 struct ieee80211_if_managed *mgd = &sdata->u.mgd; 636 struct sta_info *sta = NULL; 637 bool authorized = false; 638 639 if (!mgd->powersave) 640 return false; 641 642 if (mgd->broken_ap) 643 return false; 644 645 if (!mgd->associated) 646 return false; 647 648 if (!mgd->associated->beacon_ies) 649 return false; 650 651 if (mgd->flags & (IEEE80211_STA_BEACON_POLL | 652 IEEE80211_STA_CONNECTION_POLL)) 653 return false; 654 655 rcu_read_lock(); 656 sta = sta_info_get(sdata, mgd->bssid); 657 if (sta) 658 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 659 rcu_read_unlock(); 660 661 return authorized; 662 } 663 664 /* need to hold RTNL or interface lock */ 665 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency) 666 { 667 struct ieee80211_sub_if_data *sdata, *found = NULL; 668 int count = 0; 669 int timeout; 670 671 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) { 672 local->ps_sdata = NULL; 673 return; 674 } 675 676 if (!list_empty(&local->work_list)) { 677 local->ps_sdata = NULL; 678 goto change; 679 } 680 681 list_for_each_entry(sdata, &local->interfaces, list) { 682 if (!ieee80211_sdata_running(sdata)) 683 continue; 684 if (sdata->vif.type == NL80211_IFTYPE_AP) { 685 /* If an AP vif is found, then disable PS 686 * by setting the count to zero thereby setting 687 * ps_sdata to NULL. 688 */ 689 count = 0; 690 break; 691 } 692 if (sdata->vif.type != NL80211_IFTYPE_STATION) 693 continue; 694 found = sdata; 695 count++; 696 } 697 698 if (count == 1 && ieee80211_powersave_allowed(found)) { 699 struct ieee80211_conf *conf = &local->hw.conf; 700 s32 beaconint_us; 701 702 if (latency < 0) 703 latency = pm_qos_request(PM_QOS_NETWORK_LATENCY); 704 705 beaconint_us = ieee80211_tu_to_usec( 706 found->vif.bss_conf.beacon_int); 707 708 timeout = local->dynamic_ps_forced_timeout; 709 if (timeout < 0) { 710 /* 711 * Go to full PSM if the user configures a very low 712 * latency requirement. 713 * The 2000 second value is there for compatibility 714 * until the PM_QOS_NETWORK_LATENCY is configured 715 * with real values. 716 */ 717 if (latency > (1900 * USEC_PER_MSEC) && 718 latency != (2000 * USEC_PER_SEC)) 719 timeout = 0; 720 else 721 timeout = 100; 722 } 723 local->dynamic_ps_user_timeout = timeout; 724 if (!local->disable_dynamic_ps) 725 conf->dynamic_ps_timeout = 726 local->dynamic_ps_user_timeout; 727 728 if (beaconint_us > latency) { 729 local->ps_sdata = NULL; 730 } else { 731 struct ieee80211_bss *bss; 732 int maxslp = 1; 733 u8 dtimper; 734 735 bss = (void *)found->u.mgd.associated->priv; 736 dtimper = bss->dtim_period; 737 738 /* If the TIM IE is invalid, pretend the value is 1 */ 739 if (!dtimper) 740 dtimper = 1; 741 else if (dtimper > 1) 742 maxslp = min_t(int, dtimper, 743 latency / beaconint_us); 744 745 local->hw.conf.max_sleep_period = maxslp; 746 local->hw.conf.ps_dtim_period = dtimper; 747 local->ps_sdata = found; 748 } 749 } else { 750 local->ps_sdata = NULL; 751 } 752 753 change: 754 ieee80211_change_ps(local); 755 } 756 757 void ieee80211_dynamic_ps_disable_work(struct work_struct *work) 758 { 759 struct ieee80211_local *local = 760 container_of(work, struct ieee80211_local, 761 dynamic_ps_disable_work); 762 763 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 764 local->hw.conf.flags &= ~IEEE80211_CONF_PS; 765 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 766 } 767 768 ieee80211_wake_queues_by_reason(&local->hw, 769 IEEE80211_QUEUE_STOP_REASON_PS); 770 } 771 772 void ieee80211_dynamic_ps_enable_work(struct work_struct *work) 773 { 774 struct ieee80211_local *local = 775 container_of(work, struct ieee80211_local, 776 dynamic_ps_enable_work); 777 struct ieee80211_sub_if_data *sdata = local->ps_sdata; 778 struct ieee80211_if_managed *ifmgd; 779 unsigned long flags; 780 int q; 781 782 /* can only happen when PS was just disabled anyway */ 783 if (!sdata) 784 return; 785 786 ifmgd = &sdata->u.mgd; 787 788 if (local->hw.conf.flags & IEEE80211_CONF_PS) 789 return; 790 791 if (!local->disable_dynamic_ps && 792 local->hw.conf.dynamic_ps_timeout > 0) { 793 /* don't enter PS if TX frames are pending */ 794 if (drv_tx_frames_pending(local)) { 795 mod_timer(&local->dynamic_ps_timer, jiffies + 796 msecs_to_jiffies( 797 local->hw.conf.dynamic_ps_timeout)); 798 return; 799 } 800 801 /* 802 * transmission can be stopped by others which leads to 803 * dynamic_ps_timer expiry. Postpone the ps timer if it 804 * is not the actual idle state. 805 */ 806 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 807 for (q = 0; q < local->hw.queues; q++) { 808 if (local->queue_stop_reasons[q]) { 809 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 810 flags); 811 mod_timer(&local->dynamic_ps_timer, jiffies + 812 msecs_to_jiffies( 813 local->hw.conf.dynamic_ps_timeout)); 814 return; 815 } 816 } 817 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 818 } 819 820 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) && 821 (!(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED))) { 822 netif_tx_stop_all_queues(sdata->dev); 823 824 if (drv_tx_frames_pending(local)) 825 mod_timer(&local->dynamic_ps_timer, jiffies + 826 msecs_to_jiffies( 827 local->hw.conf.dynamic_ps_timeout)); 828 else { 829 ieee80211_send_nullfunc(local, sdata, 1); 830 /* Flush to get the tx status of nullfunc frame */ 831 drv_flush(local, false); 832 } 833 } 834 835 if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) && 836 (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) || 837 (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) { 838 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; 839 local->hw.conf.flags |= IEEE80211_CONF_PS; 840 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 841 } 842 843 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) 844 netif_tx_wake_all_queues(sdata->dev); 845 } 846 847 void ieee80211_dynamic_ps_timer(unsigned long data) 848 { 849 struct ieee80211_local *local = (void *) data; 850 851 if (local->quiescing || local->suspended) 852 return; 853 854 ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work); 855 } 856 857 /* MLME */ 858 static void ieee80211_sta_wmm_params(struct ieee80211_local *local, 859 struct ieee80211_sub_if_data *sdata, 860 u8 *wmm_param, size_t wmm_param_len) 861 { 862 struct ieee80211_tx_queue_params params; 863 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 864 size_t left; 865 int count; 866 u8 *pos, uapsd_queues = 0; 867 868 if (!local->ops->conf_tx) 869 return; 870 871 if (local->hw.queues < 4) 872 return; 873 874 if (!wmm_param) 875 return; 876 877 if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1) 878 return; 879 880 if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) 881 uapsd_queues = local->uapsd_queues; 882 883 count = wmm_param[6] & 0x0f; 884 if (count == ifmgd->wmm_last_param_set) 885 return; 886 ifmgd->wmm_last_param_set = count; 887 888 pos = wmm_param + 8; 889 left = wmm_param_len - 8; 890 891 memset(¶ms, 0, sizeof(params)); 892 893 local->wmm_acm = 0; 894 for (; left >= 4; left -= 4, pos += 4) { 895 int aci = (pos[0] >> 5) & 0x03; 896 int acm = (pos[0] >> 4) & 0x01; 897 bool uapsd = false; 898 int queue; 899 900 switch (aci) { 901 case 1: /* AC_BK */ 902 queue = 3; 903 if (acm) 904 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */ 905 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK) 906 uapsd = true; 907 break; 908 case 2: /* AC_VI */ 909 queue = 1; 910 if (acm) 911 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */ 912 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI) 913 uapsd = true; 914 break; 915 case 3: /* AC_VO */ 916 queue = 0; 917 if (acm) 918 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */ 919 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) 920 uapsd = true; 921 break; 922 case 0: /* AC_BE */ 923 default: 924 queue = 2; 925 if (acm) 926 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */ 927 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE) 928 uapsd = true; 929 break; 930 } 931 932 params.aifs = pos[0] & 0x0f; 933 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4); 934 params.cw_min = ecw2cw(pos[1] & 0x0f); 935 params.txop = get_unaligned_le16(pos + 2); 936 params.uapsd = uapsd; 937 938 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 939 wiphy_debug(local->hw.wiphy, 940 "WMM queue=%d aci=%d acm=%d aifs=%d " 941 "cWmin=%d cWmax=%d txop=%d uapsd=%d\n", 942 queue, aci, acm, 943 params.aifs, params.cw_min, params.cw_max, 944 params.txop, params.uapsd); 945 #endif 946 sdata->tx_conf[queue] = params; 947 if (drv_conf_tx(local, sdata, queue, ¶ms)) 948 wiphy_debug(local->hw.wiphy, 949 "failed to set TX queue parameters for queue %d\n", 950 queue); 951 } 952 953 /* enable WMM or activate new settings */ 954 sdata->vif.bss_conf.qos = true; 955 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS); 956 } 957 958 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata, 959 u16 capab, bool erp_valid, u8 erp) 960 { 961 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 962 u32 changed = 0; 963 bool use_protection; 964 bool use_short_preamble; 965 bool use_short_slot; 966 967 if (erp_valid) { 968 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0; 969 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0; 970 } else { 971 use_protection = false; 972 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE); 973 } 974 975 use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME); 976 if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ) 977 use_short_slot = true; 978 979 if (use_protection != bss_conf->use_cts_prot) { 980 bss_conf->use_cts_prot = use_protection; 981 changed |= BSS_CHANGED_ERP_CTS_PROT; 982 } 983 984 if (use_short_preamble != bss_conf->use_short_preamble) { 985 bss_conf->use_short_preamble = use_short_preamble; 986 changed |= BSS_CHANGED_ERP_PREAMBLE; 987 } 988 989 if (use_short_slot != bss_conf->use_short_slot) { 990 bss_conf->use_short_slot = use_short_slot; 991 changed |= BSS_CHANGED_ERP_SLOT; 992 } 993 994 return changed; 995 } 996 997 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata, 998 struct cfg80211_bss *cbss, 999 u32 bss_info_changed) 1000 { 1001 struct ieee80211_bss *bss = (void *)cbss->priv; 1002 struct ieee80211_local *local = sdata->local; 1003 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 1004 1005 bss_info_changed |= BSS_CHANGED_ASSOC; 1006 /* set timing information */ 1007 bss_conf->beacon_int = cbss->beacon_interval; 1008 bss_conf->timestamp = cbss->tsf; 1009 1010 bss_info_changed |= BSS_CHANGED_BEACON_INT; 1011 bss_info_changed |= ieee80211_handle_bss_capability(sdata, 1012 cbss->capability, bss->has_erp_value, bss->erp_value); 1013 1014 sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec( 1015 IEEE80211_BEACON_LOSS_COUNT * bss_conf->beacon_int)); 1016 1017 sdata->u.mgd.associated = cbss; 1018 memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN); 1019 1020 sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE; 1021 1022 /* just to be sure */ 1023 sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL | 1024 IEEE80211_STA_BEACON_POLL); 1025 1026 ieee80211_led_assoc(local, 1); 1027 1028 if (local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD) 1029 bss_conf->dtim_period = bss->dtim_period; 1030 else 1031 bss_conf->dtim_period = 0; 1032 1033 bss_conf->assoc = 1; 1034 /* 1035 * For now just always ask the driver to update the basic rateset 1036 * when we have associated, we aren't checking whether it actually 1037 * changed or not. 1038 */ 1039 bss_info_changed |= BSS_CHANGED_BASIC_RATES; 1040 1041 /* And the BSSID changed - we're associated now */ 1042 bss_info_changed |= BSS_CHANGED_BSSID; 1043 1044 /* Tell the driver to monitor connection quality (if supported) */ 1045 if ((local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI) && 1046 bss_conf->cqm_rssi_thold) 1047 bss_info_changed |= BSS_CHANGED_CQM; 1048 1049 /* Enable ARP filtering */ 1050 if (bss_conf->arp_filter_enabled != sdata->arp_filter_state) { 1051 bss_conf->arp_filter_enabled = sdata->arp_filter_state; 1052 bss_info_changed |= BSS_CHANGED_ARP_FILTER; 1053 } 1054 1055 ieee80211_bss_info_change_notify(sdata, bss_info_changed); 1056 1057 mutex_lock(&local->iflist_mtx); 1058 ieee80211_recalc_ps(local, -1); 1059 ieee80211_recalc_smps(local); 1060 mutex_unlock(&local->iflist_mtx); 1061 1062 netif_tx_start_all_queues(sdata->dev); 1063 netif_carrier_on(sdata->dev); 1064 } 1065 1066 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata, 1067 bool remove_sta, bool tx) 1068 { 1069 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1070 struct ieee80211_local *local = sdata->local; 1071 struct sta_info *sta; 1072 u32 changed = 0, config_changed = 0; 1073 u8 bssid[ETH_ALEN]; 1074 1075 ASSERT_MGD_MTX(ifmgd); 1076 1077 if (WARN_ON(!ifmgd->associated)) 1078 return; 1079 1080 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN); 1081 1082 ifmgd->associated = NULL; 1083 memset(ifmgd->bssid, 0, ETH_ALEN); 1084 1085 /* 1086 * we need to commit the associated = NULL change because the 1087 * scan code uses that to determine whether this iface should 1088 * go to/wake up from powersave or not -- and could otherwise 1089 * wake the queues erroneously. 1090 */ 1091 smp_mb(); 1092 1093 /* 1094 * Thus, we can only afterwards stop the queues -- to account 1095 * for the case where another CPU is finishing a scan at this 1096 * time -- we don't want the scan code to enable queues. 1097 */ 1098 1099 netif_tx_stop_all_queues(sdata->dev); 1100 netif_carrier_off(sdata->dev); 1101 1102 mutex_lock(&local->sta_mtx); 1103 sta = sta_info_get(sdata, bssid); 1104 if (sta) { 1105 set_sta_flag(sta, WLAN_STA_BLOCK_BA); 1106 ieee80211_sta_tear_down_BA_sessions(sta, tx); 1107 } 1108 mutex_unlock(&local->sta_mtx); 1109 1110 changed |= ieee80211_reset_erp_info(sdata); 1111 1112 ieee80211_led_assoc(local, 0); 1113 changed |= BSS_CHANGED_ASSOC; 1114 sdata->vif.bss_conf.assoc = false; 1115 1116 ieee80211_set_wmm_default(sdata); 1117 1118 /* channel(_type) changes are handled by ieee80211_hw_config */ 1119 WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT)); 1120 1121 /* on the next assoc, re-program HT parameters */ 1122 sdata->ht_opmode_valid = false; 1123 1124 local->power_constr_level = 0; 1125 1126 del_timer_sync(&local->dynamic_ps_timer); 1127 cancel_work_sync(&local->dynamic_ps_enable_work); 1128 1129 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 1130 local->hw.conf.flags &= ~IEEE80211_CONF_PS; 1131 config_changed |= IEEE80211_CONF_CHANGE_PS; 1132 } 1133 local->ps_sdata = NULL; 1134 1135 ieee80211_hw_config(local, config_changed); 1136 1137 /* Disable ARP filtering */ 1138 if (sdata->vif.bss_conf.arp_filter_enabled) { 1139 sdata->vif.bss_conf.arp_filter_enabled = false; 1140 changed |= BSS_CHANGED_ARP_FILTER; 1141 } 1142 1143 /* The BSSID (not really interesting) and HT changed */ 1144 changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT; 1145 ieee80211_bss_info_change_notify(sdata, changed); 1146 1147 /* remove AP and TDLS peers */ 1148 if (remove_sta) 1149 sta_info_flush(local, sdata); 1150 1151 del_timer_sync(&sdata->u.mgd.conn_mon_timer); 1152 del_timer_sync(&sdata->u.mgd.bcn_mon_timer); 1153 del_timer_sync(&sdata->u.mgd.timer); 1154 del_timer_sync(&sdata->u.mgd.chswitch_timer); 1155 } 1156 1157 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata, 1158 struct ieee80211_hdr *hdr) 1159 { 1160 /* 1161 * We can postpone the mgd.timer whenever receiving unicast frames 1162 * from AP because we know that the connection is working both ways 1163 * at that time. But multicast frames (and hence also beacons) must 1164 * be ignored here, because we need to trigger the timer during 1165 * data idle periods for sending the periodic probe request to the 1166 * AP we're connected to. 1167 */ 1168 if (is_multicast_ether_addr(hdr->addr1)) 1169 return; 1170 1171 ieee80211_sta_reset_conn_monitor(sdata); 1172 } 1173 1174 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata) 1175 { 1176 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1177 1178 if (!(ifmgd->flags & (IEEE80211_STA_BEACON_POLL | 1179 IEEE80211_STA_CONNECTION_POLL))) 1180 return; 1181 1182 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL | 1183 IEEE80211_STA_BEACON_POLL); 1184 mutex_lock(&sdata->local->iflist_mtx); 1185 ieee80211_recalc_ps(sdata->local, -1); 1186 mutex_unlock(&sdata->local->iflist_mtx); 1187 1188 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR) 1189 return; 1190 1191 /* 1192 * We've received a probe response, but are not sure whether 1193 * we have or will be receiving any beacons or data, so let's 1194 * schedule the timers again, just in case. 1195 */ 1196 ieee80211_sta_reset_beacon_monitor(sdata); 1197 1198 mod_timer(&ifmgd->conn_mon_timer, 1199 round_jiffies_up(jiffies + 1200 IEEE80211_CONNECTION_IDLE_TIME)); 1201 } 1202 1203 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata, 1204 struct ieee80211_hdr *hdr, bool ack) 1205 { 1206 if (!ieee80211_is_data(hdr->frame_control)) 1207 return; 1208 1209 if (ack) 1210 ieee80211_sta_reset_conn_monitor(sdata); 1211 1212 if (ieee80211_is_nullfunc(hdr->frame_control) && 1213 sdata->u.mgd.probe_send_count > 0) { 1214 if (ack) 1215 sdata->u.mgd.probe_send_count = 0; 1216 else 1217 sdata->u.mgd.nullfunc_failed = true; 1218 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 1219 } 1220 } 1221 1222 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata) 1223 { 1224 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1225 const u8 *ssid; 1226 u8 *dst = ifmgd->associated->bssid; 1227 u8 unicast_limit = max(1, max_probe_tries - 3); 1228 1229 /* 1230 * Try sending broadcast probe requests for the last three 1231 * probe requests after the first ones failed since some 1232 * buggy APs only support broadcast probe requests. 1233 */ 1234 if (ifmgd->probe_send_count >= unicast_limit) 1235 dst = NULL; 1236 1237 /* 1238 * When the hardware reports an accurate Tx ACK status, it's 1239 * better to send a nullfunc frame instead of a probe request, 1240 * as it will kick us off the AP quickly if we aren't associated 1241 * anymore. The timeout will be reset if the frame is ACKed by 1242 * the AP. 1243 */ 1244 if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) { 1245 ifmgd->nullfunc_failed = false; 1246 ieee80211_send_nullfunc(sdata->local, sdata, 0); 1247 } else { 1248 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID); 1249 ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid[1], NULL, 0, 1250 (u32) -1, true, false); 1251 } 1252 1253 ifmgd->probe_send_count++; 1254 ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms); 1255 run_again(ifmgd, ifmgd->probe_timeout); 1256 } 1257 1258 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata, 1259 bool beacon) 1260 { 1261 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1262 bool already = false; 1263 1264 if (!ieee80211_sdata_running(sdata)) 1265 return; 1266 1267 if (sdata->local->scanning) 1268 return; 1269 1270 if (sdata->local->tmp_channel) 1271 return; 1272 1273 mutex_lock(&ifmgd->mtx); 1274 1275 if (!ifmgd->associated) 1276 goto out; 1277 1278 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1279 if (beacon && net_ratelimit()) 1280 printk(KERN_DEBUG "%s: detected beacon loss from AP " 1281 "- sending probe request\n", sdata->name); 1282 #endif 1283 1284 /* 1285 * The driver/our work has already reported this event or the 1286 * connection monitoring has kicked in and we have already sent 1287 * a probe request. Or maybe the AP died and the driver keeps 1288 * reporting until we disassociate... 1289 * 1290 * In either case we have to ignore the current call to this 1291 * function (except for setting the correct probe reason bit) 1292 * because otherwise we would reset the timer every time and 1293 * never check whether we received a probe response! 1294 */ 1295 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL | 1296 IEEE80211_STA_CONNECTION_POLL)) 1297 already = true; 1298 1299 if (beacon) 1300 ifmgd->flags |= IEEE80211_STA_BEACON_POLL; 1301 else 1302 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL; 1303 1304 if (already) 1305 goto out; 1306 1307 mutex_lock(&sdata->local->iflist_mtx); 1308 ieee80211_recalc_ps(sdata->local, -1); 1309 mutex_unlock(&sdata->local->iflist_mtx); 1310 1311 ifmgd->probe_send_count = 0; 1312 ieee80211_mgd_probe_ap_send(sdata); 1313 out: 1314 mutex_unlock(&ifmgd->mtx); 1315 } 1316 1317 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw, 1318 struct ieee80211_vif *vif) 1319 { 1320 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1321 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1322 struct sk_buff *skb; 1323 const u8 *ssid; 1324 1325 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION)) 1326 return NULL; 1327 1328 ASSERT_MGD_MTX(ifmgd); 1329 1330 if (!ifmgd->associated) 1331 return NULL; 1332 1333 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID); 1334 skb = ieee80211_build_probe_req(sdata, ifmgd->associated->bssid, 1335 (u32) -1, ssid + 2, ssid[1], 1336 NULL, 0, true); 1337 1338 return skb; 1339 } 1340 EXPORT_SYMBOL(ieee80211_ap_probereq_get); 1341 1342 static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata) 1343 { 1344 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1345 struct ieee80211_local *local = sdata->local; 1346 u8 bssid[ETH_ALEN]; 1347 1348 mutex_lock(&ifmgd->mtx); 1349 if (!ifmgd->associated) { 1350 mutex_unlock(&ifmgd->mtx); 1351 return; 1352 } 1353 1354 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN); 1355 1356 printk(KERN_DEBUG "%s: Connection to AP %pM lost.\n", 1357 sdata->name, bssid); 1358 1359 ieee80211_set_disassoc(sdata, true, true); 1360 mutex_unlock(&ifmgd->mtx); 1361 1362 mutex_lock(&local->mtx); 1363 ieee80211_recalc_idle(local); 1364 mutex_unlock(&local->mtx); 1365 /* 1366 * must be outside lock due to cfg80211, 1367 * but that's not a problem. 1368 */ 1369 ieee80211_send_deauth_disassoc(sdata, bssid, 1370 IEEE80211_STYPE_DEAUTH, 1371 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, 1372 NULL, true); 1373 } 1374 1375 void ieee80211_beacon_connection_loss_work(struct work_struct *work) 1376 { 1377 struct ieee80211_sub_if_data *sdata = 1378 container_of(work, struct ieee80211_sub_if_data, 1379 u.mgd.beacon_connection_loss_work); 1380 1381 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR) 1382 __ieee80211_connection_loss(sdata); 1383 else 1384 ieee80211_mgd_probe_ap(sdata, true); 1385 } 1386 1387 void ieee80211_beacon_loss(struct ieee80211_vif *vif) 1388 { 1389 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1390 struct ieee80211_hw *hw = &sdata->local->hw; 1391 1392 trace_api_beacon_loss(sdata); 1393 1394 WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR); 1395 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work); 1396 } 1397 EXPORT_SYMBOL(ieee80211_beacon_loss); 1398 1399 void ieee80211_connection_loss(struct ieee80211_vif *vif) 1400 { 1401 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1402 struct ieee80211_hw *hw = &sdata->local->hw; 1403 1404 trace_api_connection_loss(sdata); 1405 1406 WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR)); 1407 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work); 1408 } 1409 EXPORT_SYMBOL(ieee80211_connection_loss); 1410 1411 1412 static enum rx_mgmt_action __must_check 1413 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata, 1414 struct ieee80211_mgmt *mgmt, size_t len) 1415 { 1416 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1417 const u8 *bssid = NULL; 1418 u16 reason_code; 1419 1420 if (len < 24 + 2) 1421 return RX_MGMT_NONE; 1422 1423 ASSERT_MGD_MTX(ifmgd); 1424 1425 bssid = ifmgd->associated->bssid; 1426 1427 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code); 1428 1429 printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n", 1430 sdata->name, bssid, reason_code); 1431 1432 ieee80211_set_disassoc(sdata, true, false); 1433 mutex_lock(&sdata->local->mtx); 1434 ieee80211_recalc_idle(sdata->local); 1435 mutex_unlock(&sdata->local->mtx); 1436 1437 return RX_MGMT_CFG80211_DEAUTH; 1438 } 1439 1440 1441 static enum rx_mgmt_action __must_check 1442 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata, 1443 struct ieee80211_mgmt *mgmt, size_t len) 1444 { 1445 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1446 u16 reason_code; 1447 1448 if (len < 24 + 2) 1449 return RX_MGMT_NONE; 1450 1451 ASSERT_MGD_MTX(ifmgd); 1452 1453 if (WARN_ON(!ifmgd->associated)) 1454 return RX_MGMT_NONE; 1455 1456 if (WARN_ON(memcmp(ifmgd->associated->bssid, mgmt->sa, ETH_ALEN))) 1457 return RX_MGMT_NONE; 1458 1459 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code); 1460 1461 printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n", 1462 sdata->name, mgmt->sa, reason_code); 1463 1464 ieee80211_set_disassoc(sdata, true, false); 1465 mutex_lock(&sdata->local->mtx); 1466 ieee80211_recalc_idle(sdata->local); 1467 mutex_unlock(&sdata->local->mtx); 1468 return RX_MGMT_CFG80211_DISASSOC; 1469 } 1470 1471 1472 static bool ieee80211_assoc_success(struct ieee80211_work *wk, 1473 struct ieee80211_mgmt *mgmt, size_t len) 1474 { 1475 struct ieee80211_sub_if_data *sdata = wk->sdata; 1476 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1477 struct ieee80211_local *local = sdata->local; 1478 struct ieee80211_supported_band *sband; 1479 struct sta_info *sta; 1480 struct cfg80211_bss *cbss = wk->assoc.bss; 1481 u8 *pos; 1482 u32 rates, basic_rates; 1483 u16 capab_info, aid; 1484 struct ieee802_11_elems elems; 1485 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 1486 u32 changed = 0; 1487 int i, j, err; 1488 bool have_higher_than_11mbit = false; 1489 u16 ap_ht_cap_flags; 1490 1491 /* AssocResp and ReassocResp have identical structure */ 1492 1493 aid = le16_to_cpu(mgmt->u.assoc_resp.aid); 1494 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info); 1495 1496 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14))) 1497 printk(KERN_DEBUG 1498 "%s: invalid AID value 0x%x; bits 15:14 not set\n", 1499 sdata->name, aid); 1500 aid &= ~(BIT(15) | BIT(14)); 1501 1502 ifmgd->broken_ap = false; 1503 1504 if (aid == 0 || aid > IEEE80211_MAX_AID) { 1505 printk(KERN_DEBUG 1506 "%s: invalid AID value %d (out of range), turn off PS\n", 1507 sdata->name, aid); 1508 aid = 0; 1509 ifmgd->broken_ap = true; 1510 } 1511 1512 pos = mgmt->u.assoc_resp.variable; 1513 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems); 1514 1515 if (!elems.supp_rates) { 1516 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n", 1517 sdata->name); 1518 return false; 1519 } 1520 1521 ifmgd->aid = aid; 1522 1523 mutex_lock(&sdata->local->sta_mtx); 1524 /* 1525 * station info was already allocated and inserted before 1526 * the association and should be available to us 1527 */ 1528 sta = sta_info_get_rx(sdata, cbss->bssid); 1529 if (WARN_ON(!sta)) { 1530 mutex_unlock(&sdata->local->sta_mtx); 1531 return false; 1532 } 1533 1534 set_sta_flag(sta, WLAN_STA_AUTH); 1535 set_sta_flag(sta, WLAN_STA_ASSOC); 1536 set_sta_flag(sta, WLAN_STA_ASSOC_AP); 1537 if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT)) 1538 set_sta_flag(sta, WLAN_STA_AUTHORIZED); 1539 1540 rates = 0; 1541 basic_rates = 0; 1542 sband = local->hw.wiphy->bands[wk->chan->band]; 1543 1544 for (i = 0; i < elems.supp_rates_len; i++) { 1545 int rate = (elems.supp_rates[i] & 0x7f) * 5; 1546 bool is_basic = !!(elems.supp_rates[i] & 0x80); 1547 1548 if (rate > 110) 1549 have_higher_than_11mbit = true; 1550 1551 for (j = 0; j < sband->n_bitrates; j++) { 1552 if (sband->bitrates[j].bitrate == rate) { 1553 rates |= BIT(j); 1554 if (is_basic) 1555 basic_rates |= BIT(j); 1556 break; 1557 } 1558 } 1559 } 1560 1561 for (i = 0; i < elems.ext_supp_rates_len; i++) { 1562 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5; 1563 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80); 1564 1565 if (rate > 110) 1566 have_higher_than_11mbit = true; 1567 1568 for (j = 0; j < sband->n_bitrates; j++) { 1569 if (sband->bitrates[j].bitrate == rate) { 1570 rates |= BIT(j); 1571 if (is_basic) 1572 basic_rates |= BIT(j); 1573 break; 1574 } 1575 } 1576 } 1577 1578 sta->sta.supp_rates[wk->chan->band] = rates; 1579 sdata->vif.bss_conf.basic_rates = basic_rates; 1580 1581 /* cf. IEEE 802.11 9.2.12 */ 1582 if (wk->chan->band == IEEE80211_BAND_2GHZ && 1583 have_higher_than_11mbit) 1584 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE; 1585 else 1586 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE; 1587 1588 if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) 1589 ieee80211_ht_cap_ie_to_sta_ht_cap(sband, 1590 elems.ht_cap_elem, &sta->sta.ht_cap); 1591 1592 ap_ht_cap_flags = sta->sta.ht_cap.cap; 1593 1594 rate_control_rate_init(sta); 1595 1596 if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED) 1597 set_sta_flag(sta, WLAN_STA_MFP); 1598 1599 if (elems.wmm_param) 1600 set_sta_flag(sta, WLAN_STA_WME); 1601 1602 /* sta_info_reinsert will also unlock the mutex lock */ 1603 err = sta_info_reinsert(sta); 1604 sta = NULL; 1605 if (err) { 1606 printk(KERN_DEBUG "%s: failed to insert STA entry for" 1607 " the AP (error %d)\n", sdata->name, err); 1608 return false; 1609 } 1610 1611 /* 1612 * Always handle WMM once after association regardless 1613 * of the first value the AP uses. Setting -1 here has 1614 * that effect because the AP values is an unsigned 1615 * 4-bit value. 1616 */ 1617 ifmgd->wmm_last_param_set = -1; 1618 1619 if (elems.wmm_param) 1620 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param, 1621 elems.wmm_param_len); 1622 else 1623 ieee80211_set_wmm_default(sdata); 1624 1625 local->oper_channel = wk->chan; 1626 1627 if (elems.ht_info_elem && elems.wmm_param && 1628 (sdata->local->hw.queues >= 4) && 1629 !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) 1630 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem, 1631 cbss->bssid, ap_ht_cap_flags, 1632 false); 1633 1634 /* set AID and assoc capability, 1635 * ieee80211_set_associated() will tell the driver */ 1636 bss_conf->aid = aid; 1637 bss_conf->assoc_capability = capab_info; 1638 ieee80211_set_associated(sdata, cbss, changed); 1639 1640 /* 1641 * If we're using 4-addr mode, let the AP know that we're 1642 * doing so, so that it can create the STA VLAN on its side 1643 */ 1644 if (ifmgd->use_4addr) 1645 ieee80211_send_4addr_nullfunc(local, sdata); 1646 1647 /* 1648 * Start timer to probe the connection to the AP now. 1649 * Also start the timer that will detect beacon loss. 1650 */ 1651 ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt); 1652 ieee80211_sta_reset_beacon_monitor(sdata); 1653 1654 return true; 1655 } 1656 1657 1658 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata, 1659 struct ieee80211_mgmt *mgmt, 1660 size_t len, 1661 struct ieee80211_rx_status *rx_status, 1662 struct ieee802_11_elems *elems, 1663 bool beacon) 1664 { 1665 struct ieee80211_local *local = sdata->local; 1666 int freq; 1667 struct ieee80211_bss *bss; 1668 struct ieee80211_channel *channel; 1669 bool need_ps = false; 1670 1671 if (sdata->u.mgd.associated) { 1672 bss = (void *)sdata->u.mgd.associated->priv; 1673 /* not previously set so we may need to recalc */ 1674 need_ps = !bss->dtim_period; 1675 } 1676 1677 if (elems->ds_params && elems->ds_params_len == 1) 1678 freq = ieee80211_channel_to_frequency(elems->ds_params[0], 1679 rx_status->band); 1680 else 1681 freq = rx_status->freq; 1682 1683 channel = ieee80211_get_channel(local->hw.wiphy, freq); 1684 1685 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) 1686 return; 1687 1688 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems, 1689 channel, beacon); 1690 if (bss) 1691 ieee80211_rx_bss_put(local, bss); 1692 1693 if (!sdata->u.mgd.associated) 1694 return; 1695 1696 if (need_ps) { 1697 mutex_lock(&local->iflist_mtx); 1698 ieee80211_recalc_ps(local, -1); 1699 mutex_unlock(&local->iflist_mtx); 1700 } 1701 1702 if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) && 1703 (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid, 1704 ETH_ALEN) == 0)) { 1705 struct ieee80211_channel_sw_ie *sw_elem = 1706 (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem; 1707 ieee80211_sta_process_chanswitch(sdata, sw_elem, 1708 bss, rx_status->mactime); 1709 } 1710 } 1711 1712 1713 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata, 1714 struct sk_buff *skb) 1715 { 1716 struct ieee80211_mgmt *mgmt = (void *)skb->data; 1717 struct ieee80211_if_managed *ifmgd; 1718 struct ieee80211_rx_status *rx_status = (void *) skb->cb; 1719 size_t baselen, len = skb->len; 1720 struct ieee802_11_elems elems; 1721 1722 ifmgd = &sdata->u.mgd; 1723 1724 ASSERT_MGD_MTX(ifmgd); 1725 1726 if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN)) 1727 return; /* ignore ProbeResp to foreign address */ 1728 1729 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; 1730 if (baselen > len) 1731 return; 1732 1733 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, 1734 &elems); 1735 1736 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false); 1737 1738 if (ifmgd->associated && 1739 memcmp(mgmt->bssid, ifmgd->associated->bssid, ETH_ALEN) == 0) 1740 ieee80211_reset_ap_probe(sdata); 1741 } 1742 1743 /* 1744 * This is the canonical list of information elements we care about, 1745 * the filter code also gives us all changes to the Microsoft OUI 1746 * (00:50:F2) vendor IE which is used for WMM which we need to track. 1747 * 1748 * We implement beacon filtering in software since that means we can 1749 * avoid processing the frame here and in cfg80211, and userspace 1750 * will not be able to tell whether the hardware supports it or not. 1751 * 1752 * XXX: This list needs to be dynamic -- userspace needs to be able to 1753 * add items it requires. It also needs to be able to tell us to 1754 * look out for other vendor IEs. 1755 */ 1756 static const u64 care_about_ies = 1757 (1ULL << WLAN_EID_COUNTRY) | 1758 (1ULL << WLAN_EID_ERP_INFO) | 1759 (1ULL << WLAN_EID_CHANNEL_SWITCH) | 1760 (1ULL << WLAN_EID_PWR_CONSTRAINT) | 1761 (1ULL << WLAN_EID_HT_CAPABILITY) | 1762 (1ULL << WLAN_EID_HT_INFORMATION); 1763 1764 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata, 1765 struct ieee80211_mgmt *mgmt, 1766 size_t len, 1767 struct ieee80211_rx_status *rx_status) 1768 { 1769 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1770 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 1771 size_t baselen; 1772 struct ieee802_11_elems elems; 1773 struct ieee80211_local *local = sdata->local; 1774 u32 changed = 0; 1775 bool erp_valid, directed_tim = false; 1776 u8 erp_value = 0; 1777 u32 ncrc; 1778 u8 *bssid; 1779 1780 ASSERT_MGD_MTX(ifmgd); 1781 1782 /* Process beacon from the current BSS */ 1783 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt; 1784 if (baselen > len) 1785 return; 1786 1787 if (rx_status->freq != local->hw.conf.channel->center_freq) 1788 return; 1789 1790 /* 1791 * We might have received a number of frames, among them a 1792 * disassoc frame and a beacon... 1793 */ 1794 if (!ifmgd->associated) 1795 return; 1796 1797 bssid = ifmgd->associated->bssid; 1798 1799 /* 1800 * And in theory even frames from a different AP we were just 1801 * associated to a split-second ago! 1802 */ 1803 if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0) 1804 return; 1805 1806 /* Track average RSSI from the Beacon frames of the current AP */ 1807 ifmgd->last_beacon_signal = rx_status->signal; 1808 if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) { 1809 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE; 1810 ifmgd->ave_beacon_signal = rx_status->signal * 16; 1811 ifmgd->last_cqm_event_signal = 0; 1812 ifmgd->count_beacon_signal = 1; 1813 ifmgd->last_ave_beacon_signal = 0; 1814 } else { 1815 ifmgd->ave_beacon_signal = 1816 (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 + 1817 (16 - IEEE80211_SIGNAL_AVE_WEIGHT) * 1818 ifmgd->ave_beacon_signal) / 16; 1819 ifmgd->count_beacon_signal++; 1820 } 1821 1822 if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold && 1823 ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) { 1824 int sig = ifmgd->ave_beacon_signal; 1825 int last_sig = ifmgd->last_ave_beacon_signal; 1826 1827 /* 1828 * if signal crosses either of the boundaries, invoke callback 1829 * with appropriate parameters 1830 */ 1831 if (sig > ifmgd->rssi_max_thold && 1832 (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) { 1833 ifmgd->last_ave_beacon_signal = sig; 1834 drv_rssi_callback(local, RSSI_EVENT_HIGH); 1835 } else if (sig < ifmgd->rssi_min_thold && 1836 (last_sig >= ifmgd->rssi_max_thold || 1837 last_sig == 0)) { 1838 ifmgd->last_ave_beacon_signal = sig; 1839 drv_rssi_callback(local, RSSI_EVENT_LOW); 1840 } 1841 } 1842 1843 if (bss_conf->cqm_rssi_thold && 1844 ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT && 1845 !(local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI)) { 1846 int sig = ifmgd->ave_beacon_signal / 16; 1847 int last_event = ifmgd->last_cqm_event_signal; 1848 int thold = bss_conf->cqm_rssi_thold; 1849 int hyst = bss_conf->cqm_rssi_hyst; 1850 if (sig < thold && 1851 (last_event == 0 || sig < last_event - hyst)) { 1852 ifmgd->last_cqm_event_signal = sig; 1853 ieee80211_cqm_rssi_notify( 1854 &sdata->vif, 1855 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW, 1856 GFP_KERNEL); 1857 } else if (sig > thold && 1858 (last_event == 0 || sig > last_event + hyst)) { 1859 ifmgd->last_cqm_event_signal = sig; 1860 ieee80211_cqm_rssi_notify( 1861 &sdata->vif, 1862 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH, 1863 GFP_KERNEL); 1864 } 1865 } 1866 1867 if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) { 1868 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1869 if (net_ratelimit()) { 1870 printk(KERN_DEBUG "%s: cancelling probereq poll due " 1871 "to a received beacon\n", sdata->name); 1872 } 1873 #endif 1874 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL; 1875 mutex_lock(&local->iflist_mtx); 1876 ieee80211_recalc_ps(local, -1); 1877 mutex_unlock(&local->iflist_mtx); 1878 } 1879 1880 /* 1881 * Push the beacon loss detection into the future since 1882 * we are processing a beacon from the AP just now. 1883 */ 1884 ieee80211_sta_reset_beacon_monitor(sdata); 1885 1886 ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4); 1887 ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable, 1888 len - baselen, &elems, 1889 care_about_ies, ncrc); 1890 1891 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) 1892 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len, 1893 ifmgd->aid); 1894 1895 if (ncrc != ifmgd->beacon_crc || !ifmgd->beacon_crc_valid) { 1896 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, 1897 true); 1898 1899 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param, 1900 elems.wmm_param_len); 1901 } 1902 1903 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) { 1904 if (directed_tim) { 1905 if (local->hw.conf.dynamic_ps_timeout > 0) { 1906 local->hw.conf.flags &= ~IEEE80211_CONF_PS; 1907 ieee80211_hw_config(local, 1908 IEEE80211_CONF_CHANGE_PS); 1909 ieee80211_send_nullfunc(local, sdata, 0); 1910 } else { 1911 local->pspolling = true; 1912 1913 /* 1914 * Here is assumed that the driver will be 1915 * able to send ps-poll frame and receive a 1916 * response even though power save mode is 1917 * enabled, but some drivers might require 1918 * to disable power save here. This needs 1919 * to be investigated. 1920 */ 1921 ieee80211_send_pspoll(local, sdata); 1922 } 1923 } 1924 } 1925 1926 if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid) 1927 return; 1928 ifmgd->beacon_crc = ncrc; 1929 ifmgd->beacon_crc_valid = true; 1930 1931 if (elems.erp_info && elems.erp_info_len >= 1) { 1932 erp_valid = true; 1933 erp_value = elems.erp_info[0]; 1934 } else { 1935 erp_valid = false; 1936 } 1937 changed |= ieee80211_handle_bss_capability(sdata, 1938 le16_to_cpu(mgmt->u.beacon.capab_info), 1939 erp_valid, erp_value); 1940 1941 1942 if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param && 1943 !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) { 1944 struct sta_info *sta; 1945 struct ieee80211_supported_band *sband; 1946 u16 ap_ht_cap_flags; 1947 1948 rcu_read_lock(); 1949 1950 sta = sta_info_get(sdata, bssid); 1951 if (WARN_ON(!sta)) { 1952 rcu_read_unlock(); 1953 return; 1954 } 1955 1956 sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; 1957 1958 ieee80211_ht_cap_ie_to_sta_ht_cap(sband, 1959 elems.ht_cap_elem, &sta->sta.ht_cap); 1960 1961 ap_ht_cap_flags = sta->sta.ht_cap.cap; 1962 1963 rcu_read_unlock(); 1964 1965 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem, 1966 bssid, ap_ht_cap_flags, true); 1967 } 1968 1969 /* Note: country IE parsing is done for us by cfg80211 */ 1970 if (elems.country_elem) { 1971 /* TODO: IBSS also needs this */ 1972 if (elems.pwr_constr_elem) 1973 ieee80211_handle_pwr_constr(sdata, 1974 le16_to_cpu(mgmt->u.probe_resp.capab_info), 1975 elems.pwr_constr_elem, 1976 elems.pwr_constr_elem_len); 1977 } 1978 1979 ieee80211_bss_info_change_notify(sdata, changed); 1980 } 1981 1982 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, 1983 struct sk_buff *skb) 1984 { 1985 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1986 struct ieee80211_rx_status *rx_status; 1987 struct ieee80211_mgmt *mgmt; 1988 enum rx_mgmt_action rma = RX_MGMT_NONE; 1989 u16 fc; 1990 1991 rx_status = (struct ieee80211_rx_status *) skb->cb; 1992 mgmt = (struct ieee80211_mgmt *) skb->data; 1993 fc = le16_to_cpu(mgmt->frame_control); 1994 1995 mutex_lock(&ifmgd->mtx); 1996 1997 if (ifmgd->associated && 1998 memcmp(ifmgd->associated->bssid, mgmt->bssid, ETH_ALEN) == 0) { 1999 switch (fc & IEEE80211_FCTL_STYPE) { 2000 case IEEE80211_STYPE_BEACON: 2001 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, 2002 rx_status); 2003 break; 2004 case IEEE80211_STYPE_PROBE_RESP: 2005 ieee80211_rx_mgmt_probe_resp(sdata, skb); 2006 break; 2007 case IEEE80211_STYPE_DEAUTH: 2008 rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len); 2009 break; 2010 case IEEE80211_STYPE_DISASSOC: 2011 rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len); 2012 break; 2013 case IEEE80211_STYPE_ACTION: 2014 switch (mgmt->u.action.category) { 2015 case WLAN_CATEGORY_SPECTRUM_MGMT: 2016 ieee80211_sta_process_chanswitch(sdata, 2017 &mgmt->u.action.u.chan_switch.sw_elem, 2018 (void *)ifmgd->associated->priv, 2019 rx_status->mactime); 2020 break; 2021 } 2022 } 2023 mutex_unlock(&ifmgd->mtx); 2024 2025 switch (rma) { 2026 case RX_MGMT_NONE: 2027 /* no action */ 2028 break; 2029 case RX_MGMT_CFG80211_DEAUTH: 2030 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len); 2031 break; 2032 case RX_MGMT_CFG80211_DISASSOC: 2033 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len); 2034 break; 2035 default: 2036 WARN(1, "unexpected: %d", rma); 2037 } 2038 return; 2039 } 2040 2041 mutex_unlock(&ifmgd->mtx); 2042 2043 if (skb->len >= 24 + 2 /* mgmt + deauth reason */ && 2044 (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DEAUTH) { 2045 struct ieee80211_local *local = sdata->local; 2046 struct ieee80211_work *wk; 2047 2048 mutex_lock(&local->mtx); 2049 list_for_each_entry(wk, &local->work_list, list) { 2050 if (wk->sdata != sdata) 2051 continue; 2052 2053 if (wk->type != IEEE80211_WORK_ASSOC && 2054 wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT) 2055 continue; 2056 2057 if (memcmp(mgmt->bssid, wk->filter_ta, ETH_ALEN)) 2058 continue; 2059 if (memcmp(mgmt->sa, wk->filter_ta, ETH_ALEN)) 2060 continue; 2061 2062 /* 2063 * Printing the message only here means we can't 2064 * spuriously print it, but it also means that it 2065 * won't be printed when the frame comes in before 2066 * we even tried to associate or in similar cases. 2067 * 2068 * Ultimately, I suspect cfg80211 should print the 2069 * messages instead. 2070 */ 2071 printk(KERN_DEBUG 2072 "%s: deauthenticated from %pM (Reason: %u)\n", 2073 sdata->name, mgmt->bssid, 2074 le16_to_cpu(mgmt->u.deauth.reason_code)); 2075 2076 list_del_rcu(&wk->list); 2077 free_work(wk); 2078 break; 2079 } 2080 mutex_unlock(&local->mtx); 2081 2082 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len); 2083 } 2084 } 2085 2086 static void ieee80211_sta_timer(unsigned long data) 2087 { 2088 struct ieee80211_sub_if_data *sdata = 2089 (struct ieee80211_sub_if_data *) data; 2090 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2091 struct ieee80211_local *local = sdata->local; 2092 2093 if (local->quiescing) { 2094 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running); 2095 return; 2096 } 2097 2098 ieee80211_queue_work(&local->hw, &sdata->work); 2099 } 2100 2101 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata, 2102 u8 *bssid, u8 reason) 2103 { 2104 struct ieee80211_local *local = sdata->local; 2105 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2106 2107 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL | 2108 IEEE80211_STA_BEACON_POLL); 2109 2110 ieee80211_set_disassoc(sdata, true, true); 2111 mutex_unlock(&ifmgd->mtx); 2112 mutex_lock(&local->mtx); 2113 ieee80211_recalc_idle(local); 2114 mutex_unlock(&local->mtx); 2115 /* 2116 * must be outside lock due to cfg80211, 2117 * but that's not a problem. 2118 */ 2119 ieee80211_send_deauth_disassoc(sdata, bssid, 2120 IEEE80211_STYPE_DEAUTH, reason, 2121 NULL, true); 2122 mutex_lock(&ifmgd->mtx); 2123 } 2124 2125 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata) 2126 { 2127 struct ieee80211_local *local = sdata->local; 2128 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2129 2130 /* then process the rest of the work */ 2131 mutex_lock(&ifmgd->mtx); 2132 2133 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL | 2134 IEEE80211_STA_CONNECTION_POLL) && 2135 ifmgd->associated) { 2136 u8 bssid[ETH_ALEN]; 2137 int max_tries; 2138 2139 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN); 2140 2141 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) 2142 max_tries = max_nullfunc_tries; 2143 else 2144 max_tries = max_probe_tries; 2145 2146 /* ACK received for nullfunc probing frame */ 2147 if (!ifmgd->probe_send_count) 2148 ieee80211_reset_ap_probe(sdata); 2149 else if (ifmgd->nullfunc_failed) { 2150 if (ifmgd->probe_send_count < max_tries) { 2151 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2152 wiphy_debug(local->hw.wiphy, 2153 "%s: No ack for nullfunc frame to" 2154 " AP %pM, try %d/%i\n", 2155 sdata->name, bssid, 2156 ifmgd->probe_send_count, max_tries); 2157 #endif 2158 ieee80211_mgd_probe_ap_send(sdata); 2159 } else { 2160 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2161 wiphy_debug(local->hw.wiphy, 2162 "%s: No ack for nullfunc frame to" 2163 " AP %pM, disconnecting.\n", 2164 sdata->name, bssid); 2165 #endif 2166 ieee80211_sta_connection_lost(sdata, bssid, 2167 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY); 2168 } 2169 } else if (time_is_after_jiffies(ifmgd->probe_timeout)) 2170 run_again(ifmgd, ifmgd->probe_timeout); 2171 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) { 2172 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2173 wiphy_debug(local->hw.wiphy, 2174 "%s: Failed to send nullfunc to AP %pM" 2175 " after %dms, disconnecting.\n", 2176 sdata->name, 2177 bssid, probe_wait_ms); 2178 #endif 2179 ieee80211_sta_connection_lost(sdata, bssid, 2180 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY); 2181 } else if (ifmgd->probe_send_count < max_tries) { 2182 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2183 wiphy_debug(local->hw.wiphy, 2184 "%s: No probe response from AP %pM" 2185 " after %dms, try %d/%i\n", 2186 sdata->name, 2187 bssid, probe_wait_ms, 2188 ifmgd->probe_send_count, max_tries); 2189 #endif 2190 ieee80211_mgd_probe_ap_send(sdata); 2191 } else { 2192 /* 2193 * We actually lost the connection ... or did we? 2194 * Let's make sure! 2195 */ 2196 wiphy_debug(local->hw.wiphy, 2197 "%s: No probe response from AP %pM" 2198 " after %dms, disconnecting.\n", 2199 sdata->name, 2200 bssid, probe_wait_ms); 2201 2202 ieee80211_sta_connection_lost(sdata, bssid, 2203 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY); 2204 } 2205 } 2206 2207 mutex_unlock(&ifmgd->mtx); 2208 } 2209 2210 static void ieee80211_sta_bcn_mon_timer(unsigned long data) 2211 { 2212 struct ieee80211_sub_if_data *sdata = 2213 (struct ieee80211_sub_if_data *) data; 2214 struct ieee80211_local *local = sdata->local; 2215 2216 if (local->quiescing) 2217 return; 2218 2219 ieee80211_queue_work(&sdata->local->hw, 2220 &sdata->u.mgd.beacon_connection_loss_work); 2221 } 2222 2223 static void ieee80211_sta_conn_mon_timer(unsigned long data) 2224 { 2225 struct ieee80211_sub_if_data *sdata = 2226 (struct ieee80211_sub_if_data *) data; 2227 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2228 struct ieee80211_local *local = sdata->local; 2229 2230 if (local->quiescing) 2231 return; 2232 2233 ieee80211_queue_work(&local->hw, &ifmgd->monitor_work); 2234 } 2235 2236 static void ieee80211_sta_monitor_work(struct work_struct *work) 2237 { 2238 struct ieee80211_sub_if_data *sdata = 2239 container_of(work, struct ieee80211_sub_if_data, 2240 u.mgd.monitor_work); 2241 2242 ieee80211_mgd_probe_ap(sdata, false); 2243 } 2244 2245 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata) 2246 { 2247 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 2248 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL | 2249 IEEE80211_STA_CONNECTION_POLL); 2250 2251 /* let's probe the connection once */ 2252 ieee80211_queue_work(&sdata->local->hw, 2253 &sdata->u.mgd.monitor_work); 2254 /* and do all the other regular work too */ 2255 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 2256 } 2257 } 2258 2259 #ifdef CONFIG_PM 2260 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata) 2261 { 2262 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2263 2264 /* 2265 * we need to use atomic bitops for the running bits 2266 * only because both timers might fire at the same 2267 * time -- the code here is properly synchronised. 2268 */ 2269 2270 cancel_work_sync(&ifmgd->request_smps_work); 2271 2272 cancel_work_sync(&ifmgd->beacon_connection_loss_work); 2273 if (del_timer_sync(&ifmgd->timer)) 2274 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running); 2275 2276 cancel_work_sync(&ifmgd->chswitch_work); 2277 if (del_timer_sync(&ifmgd->chswitch_timer)) 2278 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running); 2279 2280 cancel_work_sync(&ifmgd->monitor_work); 2281 /* these will just be re-established on connection */ 2282 del_timer_sync(&ifmgd->conn_mon_timer); 2283 del_timer_sync(&ifmgd->bcn_mon_timer); 2284 } 2285 2286 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata) 2287 { 2288 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2289 2290 if (!ifmgd->associated) 2291 return; 2292 2293 if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) { 2294 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME; 2295 mutex_lock(&ifmgd->mtx); 2296 if (ifmgd->associated) { 2297 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2298 wiphy_debug(sdata->local->hw.wiphy, 2299 "%s: driver requested disconnect after resume.\n", 2300 sdata->name); 2301 #endif 2302 ieee80211_sta_connection_lost(sdata, 2303 ifmgd->associated->bssid, 2304 WLAN_REASON_UNSPECIFIED); 2305 mutex_unlock(&ifmgd->mtx); 2306 return; 2307 } 2308 mutex_unlock(&ifmgd->mtx); 2309 } 2310 2311 if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running)) 2312 add_timer(&ifmgd->timer); 2313 if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running)) 2314 add_timer(&ifmgd->chswitch_timer); 2315 ieee80211_sta_reset_beacon_monitor(sdata); 2316 ieee80211_restart_sta_timer(sdata); 2317 ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.monitor_work); 2318 } 2319 #endif 2320 2321 /* interface setup */ 2322 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata) 2323 { 2324 struct ieee80211_if_managed *ifmgd; 2325 2326 ifmgd = &sdata->u.mgd; 2327 INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work); 2328 INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work); 2329 INIT_WORK(&ifmgd->beacon_connection_loss_work, 2330 ieee80211_beacon_connection_loss_work); 2331 INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_work); 2332 setup_timer(&ifmgd->timer, ieee80211_sta_timer, 2333 (unsigned long) sdata); 2334 setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer, 2335 (unsigned long) sdata); 2336 setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer, 2337 (unsigned long) sdata); 2338 setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer, 2339 (unsigned long) sdata); 2340 2341 ifmgd->flags = 0; 2342 2343 mutex_init(&ifmgd->mtx); 2344 2345 if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS) 2346 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC; 2347 else 2348 ifmgd->req_smps = IEEE80211_SMPS_OFF; 2349 } 2350 2351 /* scan finished notification */ 2352 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local) 2353 { 2354 struct ieee80211_sub_if_data *sdata = local->scan_sdata; 2355 2356 /* Restart STA timers */ 2357 rcu_read_lock(); 2358 list_for_each_entry_rcu(sdata, &local->interfaces, list) 2359 ieee80211_restart_sta_timer(sdata); 2360 rcu_read_unlock(); 2361 } 2362 2363 int ieee80211_max_network_latency(struct notifier_block *nb, 2364 unsigned long data, void *dummy) 2365 { 2366 s32 latency_usec = (s32) data; 2367 struct ieee80211_local *local = 2368 container_of(nb, struct ieee80211_local, 2369 network_latency_notifier); 2370 2371 mutex_lock(&local->iflist_mtx); 2372 ieee80211_recalc_ps(local, latency_usec); 2373 mutex_unlock(&local->iflist_mtx); 2374 2375 return 0; 2376 } 2377 2378 /* config hooks */ 2379 static enum work_done_result 2380 ieee80211_probe_auth_done(struct ieee80211_work *wk, 2381 struct sk_buff *skb) 2382 { 2383 struct ieee80211_local *local = wk->sdata->local; 2384 2385 if (!skb) { 2386 cfg80211_send_auth_timeout(wk->sdata->dev, wk->filter_ta); 2387 goto destroy; 2388 } 2389 2390 if (wk->type == IEEE80211_WORK_AUTH) { 2391 cfg80211_send_rx_auth(wk->sdata->dev, skb->data, skb->len); 2392 goto destroy; 2393 } 2394 2395 mutex_lock(&wk->sdata->u.mgd.mtx); 2396 ieee80211_rx_mgmt_probe_resp(wk->sdata, skb); 2397 mutex_unlock(&wk->sdata->u.mgd.mtx); 2398 2399 wk->type = IEEE80211_WORK_AUTH; 2400 wk->probe_auth.tries = 0; 2401 return WORK_DONE_REQUEUE; 2402 destroy: 2403 if (wk->probe_auth.synced) 2404 drv_finish_tx_sync(local, wk->sdata, wk->filter_ta, 2405 IEEE80211_TX_SYNC_AUTH); 2406 2407 return WORK_DONE_DESTROY; 2408 } 2409 2410 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata, 2411 struct cfg80211_auth_request *req) 2412 { 2413 const u8 *ssid; 2414 struct ieee80211_work *wk; 2415 u16 auth_alg; 2416 2417 if (req->local_state_change) 2418 return 0; /* no need to update mac80211 state */ 2419 2420 switch (req->auth_type) { 2421 case NL80211_AUTHTYPE_OPEN_SYSTEM: 2422 auth_alg = WLAN_AUTH_OPEN; 2423 break; 2424 case NL80211_AUTHTYPE_SHARED_KEY: 2425 if (IS_ERR(sdata->local->wep_tx_tfm)) 2426 return -EOPNOTSUPP; 2427 auth_alg = WLAN_AUTH_SHARED_KEY; 2428 break; 2429 case NL80211_AUTHTYPE_FT: 2430 auth_alg = WLAN_AUTH_FT; 2431 break; 2432 case NL80211_AUTHTYPE_NETWORK_EAP: 2433 auth_alg = WLAN_AUTH_LEAP; 2434 break; 2435 default: 2436 return -EOPNOTSUPP; 2437 } 2438 2439 wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL); 2440 if (!wk) 2441 return -ENOMEM; 2442 2443 memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN); 2444 2445 if (req->ie && req->ie_len) { 2446 memcpy(wk->ie, req->ie, req->ie_len); 2447 wk->ie_len = req->ie_len; 2448 } 2449 2450 if (req->key && req->key_len) { 2451 wk->probe_auth.key_len = req->key_len; 2452 wk->probe_auth.key_idx = req->key_idx; 2453 memcpy(wk->probe_auth.key, req->key, req->key_len); 2454 } 2455 2456 ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID); 2457 memcpy(wk->probe_auth.ssid, ssid + 2, ssid[1]); 2458 wk->probe_auth.ssid_len = ssid[1]; 2459 2460 wk->probe_auth.algorithm = auth_alg; 2461 wk->probe_auth.privacy = req->bss->capability & WLAN_CAPABILITY_PRIVACY; 2462 2463 /* if we already have a probe, don't probe again */ 2464 if (req->bss->proberesp_ies) 2465 wk->type = IEEE80211_WORK_AUTH; 2466 else 2467 wk->type = IEEE80211_WORK_DIRECT_PROBE; 2468 wk->chan = req->bss->channel; 2469 wk->chan_type = NL80211_CHAN_NO_HT; 2470 wk->sdata = sdata; 2471 wk->done = ieee80211_probe_auth_done; 2472 2473 ieee80211_add_work(wk); 2474 return 0; 2475 } 2476 2477 /* create and insert a dummy station entry */ 2478 static int ieee80211_pre_assoc(struct ieee80211_sub_if_data *sdata, 2479 u8 *bssid) { 2480 struct sta_info *sta; 2481 int err; 2482 2483 sta = sta_info_alloc(sdata, bssid, GFP_KERNEL); 2484 if (!sta) 2485 return -ENOMEM; 2486 2487 sta->dummy = true; 2488 2489 err = sta_info_insert(sta); 2490 sta = NULL; 2491 if (err) { 2492 printk(KERN_DEBUG "%s: failed to insert Dummy STA entry for" 2493 " the AP (error %d)\n", sdata->name, err); 2494 return err; 2495 } 2496 2497 return 0; 2498 } 2499 2500 static enum work_done_result ieee80211_assoc_done(struct ieee80211_work *wk, 2501 struct sk_buff *skb) 2502 { 2503 struct ieee80211_local *local = wk->sdata->local; 2504 struct ieee80211_mgmt *mgmt; 2505 struct ieee80211_rx_status *rx_status; 2506 struct ieee802_11_elems elems; 2507 struct cfg80211_bss *cbss = wk->assoc.bss; 2508 u16 status; 2509 2510 if (!skb) { 2511 sta_info_destroy_addr(wk->sdata, cbss->bssid); 2512 cfg80211_send_assoc_timeout(wk->sdata->dev, wk->filter_ta); 2513 goto destroy; 2514 } 2515 2516 if (wk->type == IEEE80211_WORK_ASSOC_BEACON_WAIT) { 2517 mutex_lock(&wk->sdata->u.mgd.mtx); 2518 rx_status = (void *) skb->cb; 2519 ieee802_11_parse_elems(skb->data + 24 + 12, skb->len - 24 - 12, &elems); 2520 ieee80211_rx_bss_info(wk->sdata, (void *)skb->data, skb->len, rx_status, 2521 &elems, true); 2522 mutex_unlock(&wk->sdata->u.mgd.mtx); 2523 2524 wk->type = IEEE80211_WORK_ASSOC; 2525 /* not really done yet */ 2526 return WORK_DONE_REQUEUE; 2527 } 2528 2529 mgmt = (void *)skb->data; 2530 status = le16_to_cpu(mgmt->u.assoc_resp.status_code); 2531 2532 if (status == WLAN_STATUS_SUCCESS) { 2533 if (wk->assoc.synced) 2534 drv_finish_tx_sync(local, wk->sdata, wk->filter_ta, 2535 IEEE80211_TX_SYNC_ASSOC); 2536 2537 mutex_lock(&wk->sdata->u.mgd.mtx); 2538 if (!ieee80211_assoc_success(wk, mgmt, skb->len)) { 2539 mutex_unlock(&wk->sdata->u.mgd.mtx); 2540 /* oops -- internal error -- send timeout for now */ 2541 sta_info_destroy_addr(wk->sdata, cbss->bssid); 2542 cfg80211_send_assoc_timeout(wk->sdata->dev, 2543 wk->filter_ta); 2544 return WORK_DONE_DESTROY; 2545 } 2546 2547 mutex_unlock(&wk->sdata->u.mgd.mtx); 2548 } else { 2549 /* assoc failed - destroy the dummy station entry */ 2550 sta_info_destroy_addr(wk->sdata, cbss->bssid); 2551 } 2552 2553 cfg80211_send_rx_assoc(wk->sdata->dev, skb->data, skb->len); 2554 destroy: 2555 if (wk->assoc.synced) 2556 drv_finish_tx_sync(local, wk->sdata, wk->filter_ta, 2557 IEEE80211_TX_SYNC_ASSOC); 2558 2559 return WORK_DONE_DESTROY; 2560 } 2561 2562 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata, 2563 struct cfg80211_assoc_request *req) 2564 { 2565 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2566 struct ieee80211_bss *bss = (void *)req->bss->priv; 2567 struct ieee80211_work *wk; 2568 const u8 *ssid; 2569 int i, err; 2570 2571 mutex_lock(&ifmgd->mtx); 2572 if (ifmgd->associated) { 2573 if (!req->prev_bssid || 2574 memcmp(req->prev_bssid, ifmgd->associated->bssid, 2575 ETH_ALEN)) { 2576 /* 2577 * We are already associated and the request was not a 2578 * reassociation request from the current BSS, so 2579 * reject it. 2580 */ 2581 mutex_unlock(&ifmgd->mtx); 2582 return -EALREADY; 2583 } 2584 2585 /* Trying to reassociate - clear previous association state */ 2586 ieee80211_set_disassoc(sdata, true, false); 2587 } 2588 mutex_unlock(&ifmgd->mtx); 2589 2590 wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL); 2591 if (!wk) 2592 return -ENOMEM; 2593 2594 /* 2595 * create a dummy station info entry in order 2596 * to start accepting incoming EAPOL packets from the station 2597 */ 2598 err = ieee80211_pre_assoc(sdata, req->bss->bssid); 2599 if (err) { 2600 kfree(wk); 2601 return err; 2602 } 2603 2604 ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N; 2605 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; 2606 2607 ifmgd->beacon_crc_valid = false; 2608 2609 for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) 2610 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 || 2611 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP || 2612 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) 2613 ifmgd->flags |= IEEE80211_STA_DISABLE_11N; 2614 2615 2616 if (req->ie && req->ie_len) { 2617 memcpy(wk->ie, req->ie, req->ie_len); 2618 wk->ie_len = req->ie_len; 2619 } else 2620 wk->ie_len = 0; 2621 2622 wk->assoc.bss = req->bss; 2623 2624 memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN); 2625 2626 /* new association always uses requested smps mode */ 2627 if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) { 2628 if (ifmgd->powersave) 2629 ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC; 2630 else 2631 ifmgd->ap_smps = IEEE80211_SMPS_OFF; 2632 } else 2633 ifmgd->ap_smps = ifmgd->req_smps; 2634 2635 wk->assoc.smps = ifmgd->ap_smps; 2636 /* 2637 * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode. 2638 * We still associate in non-HT mode (11a/b/g) if any one of these 2639 * ciphers is configured as pairwise. 2640 * We can set this to true for non-11n hardware, that'll be checked 2641 * separately along with the peer capabilities. 2642 */ 2643 wk->assoc.use_11n = !(ifmgd->flags & IEEE80211_STA_DISABLE_11N); 2644 wk->assoc.capability = req->bss->capability; 2645 wk->assoc.wmm_used = bss->wmm_used; 2646 wk->assoc.supp_rates = bss->supp_rates; 2647 wk->assoc.supp_rates_len = bss->supp_rates_len; 2648 wk->assoc.ht_information_ie = 2649 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION); 2650 2651 if (bss->wmm_used && bss->uapsd_supported && 2652 (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) { 2653 wk->assoc.uapsd_used = true; 2654 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED; 2655 } else { 2656 wk->assoc.uapsd_used = false; 2657 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED; 2658 } 2659 2660 ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID); 2661 memcpy(wk->assoc.ssid, ssid + 2, ssid[1]); 2662 wk->assoc.ssid_len = ssid[1]; 2663 2664 if (req->prev_bssid) 2665 memcpy(wk->assoc.prev_bssid, req->prev_bssid, ETH_ALEN); 2666 2667 wk->chan = req->bss->channel; 2668 wk->chan_type = NL80211_CHAN_NO_HT; 2669 wk->sdata = sdata; 2670 wk->done = ieee80211_assoc_done; 2671 if (!bss->dtim_period && 2672 sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD) 2673 wk->type = IEEE80211_WORK_ASSOC_BEACON_WAIT; 2674 else 2675 wk->type = IEEE80211_WORK_ASSOC; 2676 2677 if (req->use_mfp) { 2678 ifmgd->mfp = IEEE80211_MFP_REQUIRED; 2679 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED; 2680 } else { 2681 ifmgd->mfp = IEEE80211_MFP_DISABLED; 2682 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED; 2683 } 2684 2685 if (req->crypto.control_port) 2686 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT; 2687 else 2688 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT; 2689 2690 sdata->control_port_protocol = req->crypto.control_port_ethertype; 2691 sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt; 2692 2693 ieee80211_add_work(wk); 2694 return 0; 2695 } 2696 2697 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata, 2698 struct cfg80211_deauth_request *req, 2699 void *cookie) 2700 { 2701 struct ieee80211_local *local = sdata->local; 2702 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2703 struct ieee80211_work *wk; 2704 u8 bssid[ETH_ALEN]; 2705 bool assoc_bss = false; 2706 2707 mutex_lock(&ifmgd->mtx); 2708 2709 memcpy(bssid, req->bss->bssid, ETH_ALEN); 2710 if (ifmgd->associated == req->bss) { 2711 ieee80211_set_disassoc(sdata, false, true); 2712 mutex_unlock(&ifmgd->mtx); 2713 assoc_bss = true; 2714 } else { 2715 bool not_auth_yet = false; 2716 2717 mutex_unlock(&ifmgd->mtx); 2718 2719 mutex_lock(&local->mtx); 2720 list_for_each_entry(wk, &local->work_list, list) { 2721 if (wk->sdata != sdata) 2722 continue; 2723 2724 if (wk->type != IEEE80211_WORK_DIRECT_PROBE && 2725 wk->type != IEEE80211_WORK_AUTH && 2726 wk->type != IEEE80211_WORK_ASSOC && 2727 wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT) 2728 continue; 2729 2730 if (memcmp(req->bss->bssid, wk->filter_ta, ETH_ALEN)) 2731 continue; 2732 2733 not_auth_yet = wk->type == IEEE80211_WORK_DIRECT_PROBE; 2734 list_del_rcu(&wk->list); 2735 free_work(wk); 2736 break; 2737 } 2738 mutex_unlock(&local->mtx); 2739 2740 /* 2741 * If somebody requests authentication and we haven't 2742 * sent out an auth frame yet there's no need to send 2743 * out a deauth frame either. If the state was PROBE, 2744 * then this is the case. If it's AUTH we have sent a 2745 * frame, and if it's IDLE we have completed the auth 2746 * process already. 2747 */ 2748 if (not_auth_yet) { 2749 __cfg80211_auth_canceled(sdata->dev, bssid); 2750 return 0; 2751 } 2752 } 2753 2754 printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n", 2755 sdata->name, bssid, req->reason_code); 2756 2757 ieee80211_send_deauth_disassoc(sdata, bssid, IEEE80211_STYPE_DEAUTH, 2758 req->reason_code, cookie, 2759 !req->local_state_change); 2760 if (assoc_bss) 2761 sta_info_flush(sdata->local, sdata); 2762 2763 mutex_lock(&sdata->local->mtx); 2764 ieee80211_recalc_idle(sdata->local); 2765 mutex_unlock(&sdata->local->mtx); 2766 2767 return 0; 2768 } 2769 2770 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata, 2771 struct cfg80211_disassoc_request *req, 2772 void *cookie) 2773 { 2774 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2775 u8 bssid[ETH_ALEN]; 2776 2777 mutex_lock(&ifmgd->mtx); 2778 2779 /* 2780 * cfg80211 should catch this ... but it's racy since 2781 * we can receive a disassoc frame, process it, hand it 2782 * to cfg80211 while that's in a locked section already 2783 * trying to tell us that the user wants to disconnect. 2784 */ 2785 if (ifmgd->associated != req->bss) { 2786 mutex_unlock(&ifmgd->mtx); 2787 return -ENOLINK; 2788 } 2789 2790 printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n", 2791 sdata->name, req->bss->bssid, req->reason_code); 2792 2793 memcpy(bssid, req->bss->bssid, ETH_ALEN); 2794 ieee80211_set_disassoc(sdata, false, true); 2795 2796 mutex_unlock(&ifmgd->mtx); 2797 2798 ieee80211_send_deauth_disassoc(sdata, req->bss->bssid, 2799 IEEE80211_STYPE_DISASSOC, req->reason_code, 2800 cookie, !req->local_state_change); 2801 sta_info_flush(sdata->local, sdata); 2802 2803 mutex_lock(&sdata->local->mtx); 2804 ieee80211_recalc_idle(sdata->local); 2805 mutex_unlock(&sdata->local->mtx); 2806 2807 return 0; 2808 } 2809 2810 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif, 2811 enum nl80211_cqm_rssi_threshold_event rssi_event, 2812 gfp_t gfp) 2813 { 2814 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 2815 2816 trace_api_cqm_rssi_notify(sdata, rssi_event); 2817 2818 cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp); 2819 } 2820 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify); 2821 2822 unsigned char ieee80211_get_operstate(struct ieee80211_vif *vif) 2823 { 2824 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 2825 return sdata->dev->operstate; 2826 } 2827 EXPORT_SYMBOL(ieee80211_get_operstate); 2828